A method for making a treated polymer for a liquid crystal alignment agent includes the steps of: subjecting a tetracarboxylic dianhydride compound and a diamine compound to conduct a polymerization reaction to obtain an untreated polymer; preparing a co-precipitating solvent for the untreated polymer which includes a major amount of a poor solvent and a minor amount of a good solvent; and subjecting the untreated polymer to a treatment with the co-precipitating solvent such that at least a significant amount of a polymer fraction having a molecular weight not larger than 3,000 is removed from the untreated polymer to obtain the treated polymer. A treated polymer for a liquid crystal alignment agent, a liquid crystal alignment agent including the treated polymer, a liquid crystal alignment film formed of the liquid crystal alignment agent, and a liquid crystal display element including the liquid crystal alignment film are also disclosed.
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December 9, 2010
May 20, 2014
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